Add auto-fix step to CI workflow for lint and formatting

[nsheaps]

Summary

This PR enhances the CI workflow to automatically fix lint and formatting issues before running the full lint check, reducing friction in the development process.

Key Changes

• Enhanced checkout step: Added explicit ref and token configuration to the checkout action for better control over which branch is checked out
• Auto-fix lint issues: Added a new step that runs npm run lint:fix to automatically correct linting violations
• Auto-fix formatting issues: Added a new step that runs npm run check:fix to automatically correct formatting issues
• Auto-commit fixes: Added a step that commits and pushes any auto-fixed changes back to the branch with a descriptive commit message, only if changes were made

Implementation Details

• The auto-fix steps run before the main lint check, allowing the workflow to catch any remaining issues after automatic fixes
• Git is configured with the github-actions[bot] user to make the auto-fix commits
• The workflow includes a check to avoid creating empty commits when no auto-fixes are needed
• Changes are automatically pushed back to the PR branch, keeping the branch up-to-date with formatting standards

https://claude.ai/code/session_018gvgrGDfMYGubkhj9WGTQy